According to one of the guys on the PBD channel, at around 5 AM on the morning of the shooting (about 12 hours prior to the event) there was a flurry of several Google searches for "Thomas Crook".

I can't find it now but I assume that the original source was Twitter.

Maybe it was the shooter looking to see how famous he was. Maybe it was a handler who was trying to locate any online content talking about Thomas Crook in order to scrub it off.